BrowserHistoryUtils = {
	addEvent: function(elm, evType, fn, useCapture) {
		useCapture = useCapture || false;
		if (elm.addEventListener) {
			elm.addEventListener(evType, fn, useCapture);
			return true;
		}
		else if (elm.attachEvent) {
			var r = elm.attachEvent('on' + evType, fn);
			return r;
		}
		else {
			elm['on' + evType] = fn;
		}
	}
}

BrowserHistory = (function() {
	// type of browser
	var browser = {
		ie: false, 
		firefox: false, 
		safari: false, 
		opera: false, 
		version: -1
	};

	// if setDefaultURL has been called, our first clue
	// that the SWF is ready and listening
	//var swfReady = false;

	// the URL we'll send to the SWF once it is ready
	//var pendingURL = '';

	// Default app state URL to use when no fragment ID present
	var defaultHash = '';

	// Last-known app state URL
	var currentHref = document.location.href;

	// Initial URL (used only by IE)
	var initialHref = document.location.href;

	// Initial URL (used only by IE)
	var initialHash = document.location.hash;

	// History frame source URL prefix (used only by IE)
	var historyFrameSourcePrefix = 'history/historyFrame.html?';

	// History maintenance (used only by Safari)
	var currentHistoryLength = -1;

	var historyHash = [];

	var initialState = createState(initialHref, initialHref + '#' + initialHash, initialHash);

	var backStack = [];
	var forwardStack = [];

	var currentObjectId = null;

	//UserAgent detection
	var useragent = navigator.userAgent.toLowerCase();

	if (useragent.indexOf("opera") != -1) {
		browser.opera = true;
	} else if (useragent.indexOf("msie") != -1) {
		browser.ie = true;
		browser.version = parseFloat(useragent.substring(useragent.indexOf('msie') + 4));
	} else if (useragent.indexOf("safari") != -1) {
		browser.safari = true;
		browser.version = parseFloat(useragent.substring(useragent.indexOf('safari') + 7));
	} else if (useragent.indexOf("gecko") != -1) {
		browser.firefox = true;
	}

	if (browser.ie == true && browser.version == 7) {
		window["_ie_firstload"] = false;
	}

	// Accessor functions for obtaining specific elements of the page.
	function getHistoryFrame()
	{
		return document.getElementById('ie_historyFrame');
	}

	function getAnchorElement()
	{
		return document.getElementById('firefox_anchorDiv');
	}

	function getFormElement()
	{
		return document.getElementById('safari_formDiv');
	}

	function getRememberElement()
	{
		return document.getElementById("safari_remember_field");
	}

	/* Get the Flash player object for performing ExternalInterface callbacks. */
	function getPlayer(objectId) {
		var objectId = objectId || null;
		var player = null; /* AJH, needed?  = document.getElementById(getPlayerId()); */
		if (browser.ie && objectId != null) {
			player = document.getElementById(objectId);
		}
		if (player == null) {
			player = document.getElementsByTagName('object')[0];
		}
		
		if (player == null || player.object == null) {
			player = document.getElementsByTagName('embed')[0];
		}

		return player;
	}
	
	function getPlayers() {
		var players = [];
		if (players.length == 0) {
			var tmp = document.getElementsByTagName('object');
			players = tmp;
		}
		
		if (players.length == 0 || players[0].object == null) {
			var tmp = document.getElementsByTagName('embed');
			players = tmp;
		}
		return players;
	}

	function getIframeHash() {
		var doc = getHistoryFrame().contentWindow.document;
		var hash = String(doc.location.search);
		if (hash.length == 1 && hash.charAt(0) == "?") {
			hash = "";
		}
		else if (hash.length >= 2 && hash.charAt(0) == "?") {
			hash = hash.substring(1);
		}
		return hash;
	}

	/* Get the current location hash excluding the '#' symbol. */
	function getHash() {
	   // It would be nice if we could use document.location.hash here,
	   // but it's faulty sometimes.
	   var idx = document.location.href.indexOf('#');
	   return (idx >= 0) ? document.location.href.substr(idx+1) : '';
	}

	/* Get the current location hash excluding the '#' symbol. */
	function setHash(hash) {
	   // It would be nice if we could use document.location.hash here,
	   // but it's faulty sometimes.
	   if (hash == '') hash = '#'
	   document.location.hash = hash;
	}

	function createState(baseUrl, newUrl, flexAppUrl) {
		return { 'baseUrl': baseUrl, 'newUrl': newUrl, 'flexAppUrl': flexAppUrl, 'title': null };
	}

	/* Add a history entry to the browser.
	 *   baseUrl: the portion of the location prior to the '#'
	 *   newUrl: the entire new URL, including '#' and following fragment
	 *   flexAppUrl: the portion of the location following the '#' only
	 */
	function addHistoryEntry(baseUrl, newUrl, flexAppUrl) {

		//delete all the history entries
		forwardStack = [];

		if (browser.ie) {
			//Check to see if we are being asked to do a navigate for the first
			//history entry, and if so ignore, because it's coming from the creation
			//of the history iframe
			if (flexAppUrl == defaultHash && document.location.href == initialHref && window['_ie_firstload']) {
				currentHref = initialHref;
				return;
			}
			if ((!flexAppUrl || flexAppUrl == defaultHash) && window['_ie_firstload']) {
				newUrl = baseUrl + '#' + defaultHash;
				flexAppUrl = defaultHash;
			} else {
				// for IE, tell the history frame to go somewhere without a '#'
				// in order to get this entry into the browser history.
				getHistoryFrame().src = historyFrameSourcePrefix + flexAppUrl;
			}
			setHash(flexAppUrl);
		} else {

			//ADR
			if (backStack.length == 0 && initialState.flexAppUrl == flexAppUrl) {
				initialState = createState(baseUrl, newUrl, flexAppUrl);
			} else if(backStack.length > 0 && backStack[backStack.length - 1].flexAppUrl == flexAppUrl) {
				backStack[backStack.length - 1] = createState(baseUrl, newUrl, flexAppUrl);
			}

			if (browser.safari) {
				// for Safari, submit a form whose action points to the desired URL
				if (browser.version <= 419.3) {
					var file = window.location.pathname.toString();
					file = file.substring(file.lastIndexOf("/")+1);
					getFormElement().innerHTML = '<form name="historyForm" action="'+file+'#' + flexAppUrl + '" method="GET"></form>';
					//get the current elements and add them to the form
					var qs = window.location.search.substring(1);
					var qs_arr = qs.split("&");
					for (var i = 0; i < qs_arr.length; i++) {
						var tmp = qs_arr[i].split("=");
						var elem = document.createElement("input");
						elem.type = "hidden";
						elem.name = tmp[0];
						elem.value = tmp[1];
						document.forms.historyForm.appendChild(elem);
					}
					document.forms.historyForm.submit();
				} else {
					top.location.hash = flexAppUrl;
				}
				// We also have to maintain the history by hand for Safari
				historyHash[history.length] = flexAppUrl;
				_storeStates();
			} else {
				// Otherwise, write an anchor into the page and tell the browser to go there
				addAnchor(flexAppUrl);
				setHash(flexAppUrl);
			}
		}
		backStack.push(createState(baseUrl, newUrl, flexAppUrl));
	}

	function _storeStates() {
		if (browser.safari) {
			getRememberElement().value = historyHash.join(",");
		}
	}

	function handleBackButton() {
		//The "current" page is always at the top of the history stack.
		var current = backStack.pop();
		if (!current) { return; }
		var last = backStack[backStack.length - 1];
		if (!last && backStack.length == 0){
			last = initialState;
		}
		forwardStack.push(current);
	}

	function handleForwardButton() {
		//summary: private method. Do not call this directly.

		var last = forwardStack.pop();
		if (!last) { return; }
		backStack.push(last);
	}

	function handleArbitraryUrl() {
		//delete all the history entries
		forwardStack = [];
	}

	/* Called periodically to poll to see if we need to detect navigation that has occurred */
	function checkForUrlChange() {

		if (browser.ie) {
			if (currentHref != document.location.href && currentHref + '#' != document.location.href) {
				//This occurs when the user has navigated to a specific URL
				//within the app, and didn't use browser back/forward
				//IE seems to have a bug where it stops updating the URL it
				//shows the end-user at this point, but programatically it
				//appears to be correct.  Do a full app reload to get around
				//this issue.
				if (browser.version < 7) {
					currentHref = document.location.href;
					document.location.reload();
				} else {
					if (getHash() != getIframeHash()) {
						// this.iframe.src = this.blankURL + hash;
						var sourceToSet = historyFrameSourcePrefix + getHash();
						getHistoryFrame().src = sourceToSet;
					}
				}
			}
		}

		if (browser.safari) {
			// For Safari, we have to check to see if history.length changed.
			if (currentHistoryLength >= 0 && history.length != currentHistoryLength) {
				//alert("did change: " + history.length + ", " + historyHash.length + "|" + historyHash[history.length] + "|>" + historyHash.join("|"));
				// If it did change, then we have to look the old state up
				// in our hand-maintained array since document.location.hash
				// won't have changed, then call back into BrowserManager.
				currentHistoryLength = history.length;
				var flexAppUrl = historyHash[currentHistoryLength];
				if (flexAppUrl == '') {
					//flexAppUrl = defaultHash;
				}
				//ADR: to fix multiple
				if (typeof BrowserHistory_multiple != "undefined" && BrowserHistory_multiple == true) {
					var pl = getPlayers();
					for (var i = 0; i < pl.length; i++) {
						pl[i].browserURLChange(flexAppUrl);
					}
				} else {
					getPlayer().browserURLChange(flexAppUrl);
				}
				_storeStates();
			}
		}
		if (browser.firefox) {
			if (currentHref != document.location.href) {
				var bsl = backStack.length;

				var urlActions = {
					back: false, 
					forward: false, 
					set: false
				}

				if ((window.location.hash == initialHash || window.location.href == initialHref) && (bsl == 1)) {
					urlActions.back = true;
					// FIXME: could this ever be a forward button?
					// we can't clear it because we still need to check for forwards. Ugg.
					// clearInterval(this.locationTimer);
					handleBackButton();
				}
				
				// first check to see if we could have gone forward. We always halt on
				// a no-hash item.
				if (forwardStack.length > 0) {
					if (forwardStack[forwardStack.length-1].flexAppUrl == getHash()) {
						urlActions.forward = true;
						handleForwardButton();
					}
				}

				// ok, that didn't work, try someplace back in the history stack
				if ((bsl >= 2) && (backStack[bsl - 2])) {
					if (backStack[bsl - 2].flexAppUrl == getHash()) {
						urlActions.back = true;
						handleBackButton();
					}
				}
				
				if (!urlActions.back && !urlActions.forward) {
					var foundInStacks = {
						back: -1, 
						forward: -1
					}

					for (var i = 0; i < backStack.length; i++) {
						if (backStack[i].flexAppUrl == getHash() && i != (bsl - 2)) {
							arbitraryUrl = true;
							foundInStacks.back = i;
						}
					}
					for (var i = 0; i < forwardStack.length; i++) {
						if (forwardStack[i].flexAppUrl == getHash() && i != (bsl - 2)) {
							arbitraryUrl = true;
							foundInStacks.forward = i;
						}
					}
					handleArbitraryUrl();
				}

				// Firefox changed; do a callback into BrowserManager to tell it.
				currentHref = document.location.href;
				var flexAppUrl = getHash();
				if (flexAppUrl == '') {
					//flexAppUrl = defaultHash;
				}
				//ADR: to fix multiple
				if (typeof BrowserHistory_multiple != "undefined" && BrowserHistory_multiple == true) {
					var pl = getPlayers();
					for (var i = 0; i < pl.length; i++) {
						pl[i].browserURLChange(flexAppUrl);
					}
				} else {
					getPlayer().browserURLChange(flexAppUrl);
				}
			}
		}
		//setTimeout(checkForUrlChange, 50);
	}

	/* Write an anchor into the page to legitimize it as a URL for Firefox et al. */
	function addAnchor(flexAppUrl)
	{
	   if (document.getElementsByName(flexAppUrl).length == 0) {
		   getAnchorElement().innerHTML += "<a name='" + flexAppUrl + "'>" + flexAppUrl + "</a>";
	   }
	}

	var _initialize = function () {
		if (browser.ie)
		{
			var scripts = document.getElementsByTagName('script');
			for (var i = 0, s; s = scripts[i]; i++) {
				if (s.src.indexOf("history.js") > -1) {
					var iframe_location = (new String(s.src)).replace("history.js", "historyFrame.html");
				}
			}
			historyFrameSourcePrefix = iframe_location + "?";
			var src = historyFrameSourcePrefix;

			var iframe = document.createElement("iframe");
			iframe.id = 'ie_historyFrame';
			iframe.name = 'ie_historyFrame';
			//iframe.src = historyFrameSourcePrefix;
			try {
				document.body.appendChild(iframe);
			} catch(e) {
				setTimeout(function() {
					document.body.appendChild(iframe);
				}, 0);
			}
		}

		if (browser.safari)
		{
			var rememberDiv = document.createElement("div");
			rememberDiv.id = 'safari_rememberDiv';
			document.body.appendChild(rememberDiv);
			rememberDiv.innerHTML = '<input type="text" id="safari_remember_field" style="width: 500px;">';

			var formDiv = document.createElement("div");
			formDiv.id = 'safari_formDiv';
			document.body.appendChild(formDiv);

			var reloader_content = document.createElement('div');
			reloader_content.id = 'safarireloader';
			var scripts = document.getElementsByTagName('script');
			for (var i = 0, s; s = scripts[i]; i++) {
				if (s.src.indexOf("history.js") > -1) {
					html = (new String(s.src)).replace(".js", ".html");
				}
			}
			reloader_content.innerHTML = '<iframe id="safarireloader-iframe" src="about:blank" frameborder="no" scrolling="no"></iframe>';
			document.body.appendChild(reloader_content);
			reloader_content.style.position = 'absolute';
			reloader_content.style.left = reloader_content.style.top = '-9999px';
			iframe = reloader_content.getElementsByTagName('iframe')[0];

			if (document.getElementById("safari_remember_field").value != "" ) {
				historyHash = document.getElementById("safari_remember_field").value.split(",");
			}

		}

		if (browser.firefox)
		{
			var anchorDiv = document.createElement("div");
			anchorDiv.id = 'firefox_anchorDiv';
			document.body.appendChild(anchorDiv);
		}
		
		//setTimeout(checkForUrlChange, 50);
	}

	return {
		historyHash: historyHash, 
		backStack: function() { return backStack; }, 
		forwardStack: function() { return forwardStack }, 
		getPlayer: getPlayer, 
		initialize: function(src) {
			_initialize(src);
		}, 
		setURL: function(url) {
			document.location.href = url;
		}, 
		getURL: function() {
			return document.location.href;
		}, 
		getTitle: function() {
			return document.title;
		}, 
		setTitle: function(title) {
			try {
				backStack[backStack.length - 1].title = title;
			} catch(e) { }
			//if on safari, set the title to be the empty string. 
			if (browser.safari) {
				if (title == "") {
					try {
					var tmp = window.location.href.toString();
					title = tmp.substring((tmp.lastIndexOf("/")+1), tmp.lastIndexOf("#"));
					} catch(e) {
						title = "";
					}
				}
			}
			document.title = title;
		}, 
		setDefaultURL: function(def)
		{
			defaultHash = def;
			def = getHash();
			//trailing ? is important else an extra frame gets added to the history
			//when navigating back to the first page.  Alternatively could check
			//in history frame navigation to compare # and ?.
			if (browser.ie)
			{
				window['_ie_firstload'] = true;
				var sourceToSet = historyFrameSourcePrefix + def;
				var func = function() {
					getHistoryFrame().src = sourceToSet;
					window.location.replace("#" + def);
					setInterval(checkForUrlChange, 50);
				}
				try {
					func();
				} catch(e) {
					window.setTimeout(function() { func(); }, 0);
				}
			}

			if (browser.safari)
			{
				currentHistoryLength = history.length;
				if (historyHash.length == 0) {
					historyHash[currentHistoryLength] = def;
					var newloc = "#" + def;
					window.location.replace(newloc);
				} else {
					//alert(historyHash[historyHash.length-1]);
				}
				//setHash(def);
				setInterval(checkForUrlChange, 50);
			}
			
			
			if (browser.firefox || browser.opera)
			{
				var reg = new RegExp("#" + def + "$");
				if (window.location.toString().match(reg)) {
				} else {
					var newloc ="#" + def;
					window.location.replace(newloc);
				}
				setInterval(checkForUrlChange, 50);
				//setHash(def);
			}

		}, 

		/* Set the current browser URL; called from inside BrowserManager to propagate
		 * the application state out to the container.
		 */
		setBrowserURL: function(flexAppUrl, objectId) {
			if (browser.ie && typeof objectId != "undefined") {
				currentObjectId = objectId;
			}
		   //fromIframe = fromIframe || false;
		   //fromFlex = fromFlex || false;
		   //alert("setBrowserURL: " + flexAppUrl);
		   //flexAppUrl = (flexAppUrl == "") ? defaultHash : flexAppUrl ;

		   var pos = document.location.href.indexOf('#');
		   var baseUrl = pos != -1 ? document.location.href.substr(0, pos) : document.location.href;
		   var newUrl = baseUrl + '#' + flexAppUrl;

		   if (document.location.href != newUrl && document.location.href + '#' != newUrl) {
			   currentHref = newUrl;
			   addHistoryEntry(baseUrl, newUrl, flexAppUrl);
			   currentHistoryLength = history.length;
		   }

		   return false;
		}, 

		browserURLChange: function(flexAppUrl) {
			var objectId = null;
			if (browser.ie && currentObjectId != null) {
				objectId = currentObjectId;
			}
			pendingURL = '';
			
			if (typeof BrowserHistory_multiple != "undefined" && BrowserHistory_multiple == true) {
				var pl = getPlayers();
				for (var i = 0; i < pl.length; i++) {
					try {
						pl[i].browserURLChange(flexAppUrl);
					} catch(e) { }
				}
			} else {
				try {
					getPlayer(objectId).browserURLChange(flexAppUrl);
				} catch(e) { }
			}

			currentObjectId = null;
		}

	}

})();

// Initialization

// Automated unit testing and other diagnostics

function setURL(url)
{
	document.location.href = url;
}

function backButton()
{
	history.back();
}

function forwardButton()
{
	history.forward();
}

function goForwardOrBackInHistory(step)
{
	history.go(step);
}

//BrowserHistoryUtils.addEvent(window, "load", function() { BrowserHistory.initialize(); });
(function(i) {
	var u =navigator.userAgent;var e=/*@cc_on!@*/false; 
	var st = setTimeout;
	if(/webkit/i.test(u)){
		st(function(){
			var dr=document.readyState;
			if(dr=="loaded"||dr=="complete"){i()}
			else{st(arguments.callee,10);}},10);
	} else if((/mozilla/i.test(u)&&!/(compati)/.test(u)) || (/opera/i.test(u))){
		document.addEventListener("DOMContentLoaded",i,false);
	} else if(e){
	(function(){
		var t=document.createElement('doc:rdy');
		try{t.doScroll('left');
			i();t=null;
		}catch(e){st(arguments.callee,0);}})();
	} else{
		window.onload=i;
	}
})( function() {BrowserHistory.initialize();} );
